Open Street Map an opensource project to drive around and take a picture of every street in the world with Wiki-like capabilities - Cool part about this is that you can write back instead of just always reading

giving directions - another level of complexities. what direction the street goes in. attribute data is attached to streets. openstreet maps has those attributes. you can redo the routing. google now has car, walk and public transit

mapping people into congressional districts - egocode address, CONTAINS query to find out in which polygon. challenging because of things like

storing geographic data in relational databases. store lat and latitude in a geospatial

best opensource database to store data is postgis

mysql spatial extensions work kinda well. can't talk about the shape, just the rectangle.

for stuff as precise as congressional districts you need to use postgis

biggest trick - 4 sided polygon is 5 points, not 4. it has to go back to the beginning.

fireeagle - built for yahoo - collects info from cellphone

hungermaps.com

land trust accredation mapping - clustering icons for when many points overlay

slideshare.net/ andrew turner slide presentation

- geocodr.net -

onion video thing with slippy map

mountain biking site - ride with gps units, gathering data that will be shareable